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Stock-Based Compensation Plans (Tables)
9 Months Ended
Sep. 30, 2018
Equity-Based Compensation Plans [Abstract]  
Schedule of outstanding restricted stock

   Long-Term Restricted Stock 
   Number of Units   Weighted-Average
Grant-Date Fair Value
 
         
Nonvested at January 1, 2018    103,063   $ 24.08 
           
Granted during the period   66,060    40.04 
Vested during the period   (16,533)   17.31 
Forfeited or expired during the period   (2,977)   25.21 
           
Nonvested at September 30, 2018   149,613   $31.85 

 

Schedule of Company's stock options outstanding

   Options Outstanding 
   Number of
Shares
   Weighted-
Average
Exercise
Price
   Weighted-
Average
Contractual
Term (years)
   Aggregate
Intrinsic
Value
 
                 
Balance at January 1, 2018   38,689   $16.09           
                     
   Granted                  
   Exercised   (29,689)   16.61        $659,743 
   Forfeited                  
   Expired                  
                     
Outstanding at September 30, 2018   9,000   $14.35    0.7   $235,440 
                     
Exercisable at September 30, 2018   9,000   $14.35    0.7   $235,440